17990980 has 48 divisors (see below), whose sum is σ = 43618176. Its totient is φ = 6105600.

The previous prime is 17990969. The next prime is 17990983. The reversal of 17990980 is 8909971.

It is a super-2 number, since 2×17990980² = 647350722720800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17990983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14380 + ... + 15580.

It is an arithmetic number, because the mean of its divisors is an integer number (908712).

Almost surely, 2^17990980 is an apocalyptic number.

17990980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17990980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21809088).

17990980 is an abundant number, since it is smaller than the sum of its proper divisors (25627196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17990980 is a wasteful number, since it uses less digits than its factorization.

17990980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 17990980 is about 4241.5775367191. The cubic root of 17990980 is about 262.0303560189.

The spelling of 17990980 in words is "seventeen million, nine hundred ninety thousand, nine hundred eighty".